L4 Ultramaximizer is Waves' modern successor to the legendary L1 and L2 limiters, redesigned for today's streaming-first release environment. It aims to deliver loudness and dynamics together, producing masters that feel big, punchy, and alive rather than squashed. The plugin provides five unique limiting algorithms — Modern, Aggressive, Smooth, Safe, and the classic L2 sound — covering anything from delicate acoustic work to heavy electronic music.

Key features include adaptive clipping and release controls, which tailor clipping and release behavior to the content and can be fine-tuned in real time to shape transient impact. Upward compression lifts quieter passages, adding density and detail, while True Peak limiting and short-term and long-term LUFS metering help ensure levels meet delivery standards. Additional controls include upsampling, dithering, delta monitoring, and stereo link, with ultra-low latency making live use viable. It runs in VST3, AU, and AAX (AAX Native, AudioSuite) on macOS and Windows.

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